Updated 04-May-2020.
Mondo shtuff from around the internet, all about OCTOBASS!
My botty best at summarizing from Wikipedia: the octobass was first built around 1850 in Paris by the french luthier Jean-Baptiste Vuillaume (1798–1875) it has three strings and is essentially the only known work from the Nineteenth Century that specifically calls for the Octobass is Charles Gounod’s Messe solennelle de Sainte-Cécile . octobasses the Montreal Symphony Orchestra is the only orchestra in the world to own an octobass . the instrument was made by the luthier Jean-Jacques Pagès of Mirecourt, France in 2010 . on some recordings the overall tuning is a half-step flat . the instrument at the Musée de la Musique in Paris uses period-accurate gut strings . Berlioz specifically noted this tuning in his orchestra the Montreal Symphony Orchestra octobass uses gut strings, is tuned A0, E1, B1 and has a high range to F2.